Pirates, ninjas, zombies, clowns, and...?

Ideas I've had which are probably classy enough:
-Pirates: promiscuous, so large in numbers
-Ninjas: few, but more powerful
-Zombies: can make more zombies, are very durable but very slow
-Clowns: balloon swords, acid flowers, molotov cocktail water balloons
-Robots: lasers!

Ideas I've had which are less classy:
-Army: standard guns and stuff.
-Aliens: spaceships and ray guns.
-Soviets: like the army but communist!
-Giant bugs: duh
-Musicians: the power of rock!

Ideas other people have had that I like:
-Lawyers
-The Irish
-Spiders
-Penguins

oh dear, while we're singling out groups, you might as well add Hindus, Jews, Devout Athiests , Scientologists, and a few other groups that would absolutely love publicity. On second thought, religious groups may not be the best idea...

Monkeys??? with banannas
Babies with loud piercing cries
University students with empty wallets and beer bottles?